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Which of the statements about the mechan...

Which of the statements about the mechanism of muscle contraction are corrcet
(I) Acetylcholine is released when the neural signal raches the motor end plate
(II) Muscle contration is initiated by a singnal sent by CNS via a sensory neuron
(III) During muscle contration, isotropic band gets elongated
(IV) Repeated activation of the muscles can be lead to lactic acid eccumulation

A

I and IV are correct

B

I and III are correct

C

II and III are correct

D

I,II and III are correct

Text Solution

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The correct Answer is:
a
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Which of the following statements about the mechanism of muscle contraction are correct ? (i) Acetylcholine is released when the neural signal reaches the motor end plate. Muscle contraction is initiated by a signal sent by CNS via sensory neuron. (iii) During muscle contraction, isotropic band gets elongated (iv) Repeated activation of the muscles can lead to lactic acid accumulation.

Which statements about muscle contractions are true (i) Acetylcholine is released when neural signal reaches motor end plate (ii) Muscle contraction is initiated by a signal sent by CNS via a sensory neuron (iii) During muscle contraction , isotropic band gets elongated (iv) Repeated activation of the muscle can lead to lactic acid accumulation .

The steps involved in the mechanism of muscle contraction are given below. Arrange the steps in proper sequential order and select the correct option. I. Release of calcium ions in the sarcoplasm. II. Signal sent by the CNS via a motor neuron. III. Binding of calcium with a subunit of troponin on actin filaments. IV. Generation of the action potential in the sarcolemma. V. Binding of myosin head to the exposed active sites on actin to form a cross-bridge. VI. Inward pulling of ‘Z’ line attached to actin causing shortening of the sarcomere. VII. Pulling of the attached actin filaments towards the centre of 'A' band. VIII. Release of neurotransmitter acetylcholine and generation of the action potential in the sarcolemma.

Which of the following statements given below are true with reference to muscle contraction. I. Neurotransmitter acetycholine is released as nerve impulse reaches the end of axon and binds to receptor sites of motor end plate. II. Action potential passes from motor end plate over sarcoplasmic and then into the T-tubules and sarcoplasmic reticulum. III. Calcium ion are released into the sarcoplasm bind to troponin, causing a change in its shape and position. IV. Myosin cross bridges are able to bind to exposed active sites of actin. Choose the correct option.

Which of the following staements are true? (i) Sudden action in response to something in the enviornment is called reflex action (ii) Sensory neurons carry signals from spinal cord to muscles. (iii) Motor neurons carry signals from spinal cord to muscles. (iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc.

Which of the following statements are true? (i) sudden action in respons to something in the environment is called reflex action (ii) sensory neurons carry electrical signals from spinal cord to muscles in a reflex action (iii) motor neurons carry signals from receptors to spinal cord in a reflex action (iv) the pathway of transmittin signals from a receptor to a muscle is a reflex action

Which of the following statement(s) is/are correct? I. Two transmitter substances in the nervous system are dopamine and acetylcholine II. Motor neurons convey information from receptors in the periphery to the CNS III. Somatic motor nerves innervate skeletal muscles and autonomic nerves innervate smooth muscle, cardiac muscle and glands

Read the following statements and select the correct option : I. In the skeletal muscles fibre, large number of myofilaments are arranged in the sarcoplasmic . II. The central part of an anisotropic band where the only thick , filament is present and thin filament is absent is called 'A' band. III. In the resting state , a tropomyosin protein masks the active b binding sites for myosin on the active filaments . IV. The junction between a motor neuron and the sarcolemma of the muscle fibres is called motor-end plate.

Arrange the following events of muscle contraction in the sequence : (i) Generate an action potential in the sarcolemma (ii) Form a cross bridge (iii) Release a neurotransmitter (Acetylcholine) (iv) Release of calcium ions in sarcoplasm (v) Pulls the attached actin filaments towards the centre of "A" band (vi) Remove the masking of active sites for myosin The correct option is :-

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